Harry-I didn't know much about obesity in the past. But since we formed the obesity group, I have learned the causes and effects of obesity. Obesity is caused by eating lots of unhealthy food and doing little or no exercise. Osese people are more likely to suffer from diseases such as diabetes, heart disease and high blood pressure. Obese people are often unhappy and have low confidence. The community also is effected because taxes go up to pay for increased diseases.